/**
 * Copyright (C) 2011 Whisper Systems
 * Copyright (C) 2013 Open Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.appspot.eusms;

import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.appspot.eusms.crypto.IdentityKeyUtil;
import com.appspot.eusms.recipients.Recipient;
import com.appspot.eusms.util.DynamicLanguage;
import com.appspot.eusms.util.DynamicTheme;
import com.appspot.eusms.util.MemoryCleaner;

import com.appspot.eusms.R;

import org.whispersystems.textsecure.crypto.IdentityKey;
import org.whispersystems.textsecure.crypto.MasterSecret;
import org.whispersystems.textsecure.storage.Session;

/**
 * Activity for verifying identity keys.
 *
 * @author Moxie Marlinspike
 */
public class VerifyIdentityActivity extends KeyScanningActivity {

    private Recipient recipient;
    private MasterSecret masterSecret;

    private TextView localIdentityFingerprint;
    private TextView remoteIdentityFingerprint;

    private final DynamicTheme dynamicTheme = new DynamicTheme();
    private final DynamicLanguage dynamicLanguage = new DynamicLanguage();

    @Override
    public void onCreate(Bundle state) {
        dynamicTheme.onCreate(this);
        dynamicLanguage.onCreate(this);
        super.onCreate(state);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        setContentView(R.layout.verify_identity_activity);

        initializeResources();
        initializeFingerprints();
    }

    @Override
    public void onResume() {
        super.onResume();
        dynamicTheme.onResume(this);
        dynamicLanguage.onResume(this);
        getSupportActionBar().setTitle(R.string.AndroidManifest__verify_identity);

    }

    @Override
    protected void onDestroy() {
        MemoryCleaner.clean(masterSecret);
        super.onDestroy();
    }

    private void initializeLocalIdentityKey() {
        if (!IdentityKeyUtil.hasIdentityKey(this)) {
            localIdentityFingerprint.setText(R.string.VerifyIdentityActivity_you_do_not_have_an_identity_key);
            return;
        }

        localIdentityFingerprint.setText(IdentityKeyUtil.getIdentityKey(this).getFingerprint());
    }

    private void initializeRemoteIdentityKey() {
        IdentityKey identityKey = getIntent().getParcelableExtra("remote_identity");

        if (identityKey == null) {
            identityKey = Session.getRemoteIdentityKey(this, masterSecret, recipient);
        }

        if (identityKey == null) {
            remoteIdentityFingerprint.setText(R.string.VerifyIdentityActivity_recipient_has_no_identity_key);
        } else {
            remoteIdentityFingerprint.setText(identityKey.getFingerprint());
        }
    }

    private void initializeFingerprints() {
        initializeLocalIdentityKey();
        initializeRemoteIdentityKey();
    }

    private void initializeResources() {
        this.localIdentityFingerprint = (TextView) findViewById(R.id.you_read);
        this.remoteIdentityFingerprint = (TextView) findViewById(R.id.friend_reads);
        this.recipient = this.getIntent().getParcelableExtra("recipient");
        this.masterSecret = this.getIntent().getParcelableExtra("master_secret");
    }

    @Override
    protected void initiateDisplay() {
        if (!IdentityKeyUtil.hasIdentityKey(this)) {
            Toast.makeText(this,
                    R.string.VerifyIdentityActivity_you_don_t_have_an_identity_key_exclamation,
                    Toast.LENGTH_LONG).show();
            return;
        }

        super.initiateDisplay();
    }

    @Override
    protected void initiateScan() {
        IdentityKey identityKey = Session.getRemoteIdentityKey(this, masterSecret, recipient);

        if (identityKey == null) {
            Toast.makeText(this, R.string.VerifyIdentityActivity_recipient_has_no_identity_key_exclamation,
                    Toast.LENGTH_LONG).show();
        } else {
            super.initiateScan();
        }
    }

    @Override
    protected String getScanString() {
        return getString(R.string.VerifyIdentityActivity_scan_their_key_to_compare);
    }

    @Override
    protected String getDisplayString() {
        return getString(R.string.VerifyIdentityActivity_get_my_key_scanned);
    }

    @Override
    protected IdentityKey getIdentityKeyToCompare() {
        return Session.getRemoteIdentityKey(this, masterSecret, recipient);
    }

    @Override
    protected IdentityKey getIdentityKeyToDisplay() {
        return IdentityKeyUtil.getIdentityKey(this);
    }

    @Override
    protected String getNotVerifiedMessage() {
        return getString(R.string.VerifyIdentityActivity_warning_the_scanned_key_does_not_match_please_check_the_fingerprint_text_carefully);
    }

    @Override
    protected String getNotVerifiedTitle() {
        return getString(R.string.VerifyIdentityActivity_not_verified_exclamation);
    }

    @Override
    protected String getVerifiedMessage() {
        return getString(R.string.VerifyIdentityActivity_their_key_is_correct_it_is_also_necessary_to_verify_your_key_with_them_as_well);
    }

    @Override
    protected String getVerifiedTitle() {
        return getString(R.string.VerifyIdentityActivity_verified_exclamation);
    }
}
